Buggy code:
public abstract class TestKeyValueStore { protected KeyValueStore < String , Topic > store ; protected Index < String , Topic , String > bundleToTopicId ; protected abstract KeyValueStore < String , Topic > createStore ( ) { } protected KeyMapper < String , Topic > keyMapper = new KeyMapper < String , Topic > ( ) { @ Override public String getKeyOf ( Topic topic ) { } } ; @ Before public void setUp ( ) { } @ After public void tearDown ( ) { } @ Test public void testKVS ( ) { Topic t1 ; Topic t2 ; Topic t3 ; Topic t4 ; Topic t ; List < Topic > l ; store . deleteAll ( ) ; store . addValue ( ( t1 = new Topic ( "001" , "type1" , TopicKind . AAA ) ) ) ; store . addValue ( ( t2 = new Topic ( "002" , "type1" , TopicKind . AAA ) ) ) ; store . addValue ( ( t3 = new Topic ( "003" , "type3" , TopicKind . AAA ) ) ) ; store . addValue ( ( t4 = new Topic ( "004" , "type3" , TopicKind . AAA ) ) ) ; store . clearCache ( ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( t = store . get ( "001" ) ) ) ) ; assertEquals ( t , t1 ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = store . valuesFor ( Arrays . asList ( "001" , "002" ) ) ) ) ) ; assertEquals ( l , Arrays . asList ( t1 , t2 ) ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = store . valuesFor ( Arrays . asList ( "002" , "002" ) ) ) ) ) ; assertEquals ( l , Arrays . asList ( t2 , t2 ) ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = store . valuesFor ( Arrays . asList ( "xxx" , "yyy" ) ) ) ) ) ; assertTrue ( ( ( l . size ( ) ) == 0 ) ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = store . valuesFor ( Arrays . asList ( "aaa" , "003" , "yyy" , "002" , "xxx" , "001" , "004" ) ) ) ) ) ; assertEquals ( l , Arrays . asList ( t3 , t2 , t1 , t4 ) ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + "--<seq2seq4repair_space>Only<seq2seq4repair_space>type3:" ) ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = bundleToTopicId . valuesOf ( Topic . bundle ( "type3" , TopicKind . AAA ) ) ) ) ) ; assertTrue ( ( ( l . equals ( Arrays . asList ( t3 , t4 ) ) ) || ( l . equals ( Arrays . asList ( t4 , t3 ) ) ) ) ) ; System . err . println ( "-----------------------------------------------" ) ; store . update ( "003" , new com . tectonica . collections . KeyValueStore . Updater < Topic > ( ) { @ Override public boolean update ( Topic value ) { value . objId = "type0" ; return true ; } } ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + "--<seq2seq4repair_space>Only<seq2seq4repair_space>type3<seq2seq4repair_space>After<seq2seq4repair_space>removal<seq2seq4repair_space>1:" ) ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = bundleToTopicId . valuesOf ( Topic . bundle ( "type3" , TopicKind . AAA ) ) ) ) ) ; assertEquals ( l , Arrays . asList ( t4 ) ) ; System . err . println ( "-----------------------------------------------" ) ; <START_BUG> store . put ( "004" , new Topic ( "004" , "type0" , TopicKind . AAA ) ) ; <END_BUG> System . err . println ( ( "[TEST]<seq2seq4repair_space>" + "--<seq2seq4repair_space>Only<seq2seq4repair_space>type3<seq2seq4repair_space>After<seq2seq4repair_space>removal<seq2seq4repair_space>2:" ) ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( l = bundleToTopicId . valuesOf ( Topic . bundle ( "type3" , TopicKind . AAA ) ) ) ) ) ; assertTrue ( ( ( l . size ( ) ) == 0 ) ) ; System . err . println ( "-----------------------------------------------" ) ; System . err . println ( ( "[TEST]<seq2seq4repair_space>" + ( t = store . get ( "001" ) ) ) ) ; assertEquals ( t , t1 ) ; System . err . println ( "-----------------------------------------------" ) ; } }

Fix:
store . putValue ( new Topic ( "004" , "type0" , TopicKind . AAA ) ) ;